How Much Does Bac Go Down per Hour

How Much Does BAC Go Down per Hour?

Blood Alcohol Concentration (BAC) is a measure of the amount of alcohol present in a person’s bloodstream. It is commonly used to determine if an individual is under the influence of alcohol and can vary depending on a variety of factors. One frequently asked question is how much does BAC go down per hour? Let’s explore this in detail.

The rate at which BAC decreases per hour can vary from person to person. On average, BAC decreases by about 0.015 grams per deciliter (g/dL) per hour. This means that if your initial BAC is 0.08 g/dL, it would take approximately 5.33 hours for it to reach 0.00 g/dL.

However, it’s important to note that this estimate is not set in stone and can be influenced by several factors. Some of these factors include:

1. Gender: Women generally have a lower water content in their bodies, causing alcohol to be more concentrated in their bloodstream, resulting in a slower decrease in BAC.
2. Body weight: Individuals with a higher body weight tend to have a higher water content, which can help dilute alcohol and lower BAC more quickly.
3. Metabolism: People with a faster metabolism may process alcohol more efficiently, leading to a quicker decrease in BAC.
4. Tolerance: Regular alcohol consumers may develop a higher tolerance, which can affect the rate at which their BAC decreases.
5. Food consumption: Eating food before or while drinking can slow down the absorption of alcohol, potentially leading to a slower decrease in BAC.
6. Type and amount of alcohol consumed: Different types of alcoholic beverages have varying alcohol contents, which can influence the rate at which BAC decreases.
7. Hydration levels: Staying hydrated can help eliminate alcohol from the body more effectively, aiding in a faster decrease in BAC.
8. Medications: Certain medications can interact with alcohol and affect how it is metabolized, potentially altering the rate at which BAC decreases.
9. Liver health: A compromised liver may struggle to process alcohol efficiently, resulting in a slower decrease in BAC.
10. Stress levels: High-stress levels can slow down the body’s ability to metabolize alcohol, leading to a slower decrease in BAC.
11. Individual tolerance: Some individuals may naturally have a slower rate of alcohol metabolism, resulting in a slower decrease in BAC.
12. Other substances: The presence of other drugs or substances in the body can interact with alcohol and affect how it is metabolized.

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It’s important to remember that these factors can vary greatly among individuals, making it difficult to provide an exact estimate of how much BAC decreases per hour for everyone. Additionally, it is always best to avoid driving or engaging in any activities that require alertness if you have consumed alcohol, regardless of your estimated BAC.

In conclusion, while the average rate of BAC decrease is around 0.015 g/dL per hour, it can vary depending on various factors such as gender, body weight, metabolism, tolerance, and more. It is always safer to wait until your BAC reaches 0.00 g/dL before considering any activities that could be impaired by alcohol.


1. How long does it take for one drink to leave your system?
2. Does drinking water help lower BAC?
3. How long does it take to sober up after drinking heavily?
4. Can coffee help sober you up?
5. Does exercise help lower BAC?
6. Can breath mints or mouthwash affect BAC readings?
7. How accurate are portable breathalyzer devices?
8. Can eating food after drinking lower BAC?
9. Can BAC continue to rise after you stop drinking?
10. Can BAC be affected by drinking on an empty stomach?
11. How long does alcohol stay in your urine?
12. How long does alcohol stay in your hair follicles?

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